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Creation Date 

1. Before 1960  (14,344)
2. 1960 To 1962  (26,304)
3. 1963 To 1965  (27,546)
4. 1966 To 1969  (61,365)
5. After 1969  (112,870)
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Resource Type 

1. Patents  (239,379)
2. Reports  (1,729)
3. Articles  (939)
4. Images  (98)
5. Book Chapters  (35)
6. Books  (13)
7. Text Resources  (12)
8. Thesises (postgraduate)  (5)
9. Videos  (4)
10. Government Documents  (3)
11. Web Resources  (2)
12. magazinearticle  (1)
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Subject 

1. Physics  (238,534)
2. Testing  (234,554)
3. Measuring  (234,546)
4. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (62,741)
5. Measuring Magnetic Variables  (31,704)
6. Measuring Electric Variables  (31,704)
7. Electricity  (28,665)
8. Transporting  (22,213)
9. Performing Operations  (22,213)
10. Radio Navigation  (21,718)
11. Radio Direction-Finding  (21,680)
12. Analogous Arrangements Using Other Waves  (21,680)
13. Locating Or Presence-Detecting By Use Of The Reflection Orreradiation Of Radio Waves  (21,680)
14. Determining Distance Or Velocity By Use Of Radio Waves  (21,680)
15. Metering By Volume  (20,884)
16. Measuring Volume, Volume Flow, Mass Flow Or Liquidlevel  (20,884)
17. Measuring Areas  (19,639)
18. Measuring Length, Thickness Or Similar Lineardimensions  (19,639)
19. Measuring Angles  (19,639)
20. Measuring Irregularities Of Surfaces Or Contours  (19,639)
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Databases 

1. esp@cenet  (239,379)
2. DTIC STINET  (1,705)
3. DTIC Technical Reports  (1,705)
4. ProQuest Central  (190)
5. Europeana Collections  (102)
6. ProQuest One Psychology  (71)
7. MEDLINE  (62)
8. Wiley-Blackwell AGU Digital Library  (49)
9. Wiley Online Library Open Access  (47)
10. HighWire Press (Free Journals)  (26)
11. JSTOR Early Journal Content  (26)
12. DOAJ Directory of Open Access Journals  (23)
13. Hyper Article en Ligne (HAL) (Open Access)  (19)
14. Canada Commons: Books & Documents  (18)
15. GFMER Free Medical Journals  (15)
16. PubMed Central  (13)
17. SWEPUB Freely available online  (12)
18. AgEcon  (12)
19. EU BookShop  (11)
20. Oxford Journals Open Access Collection  (10)
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Language 

1. English  (164,411)
2. German  (46,273)
3. French  (23,407)
4. Russian  (5,277)
5. Spanish  (3,378)
6. Italian  (1,178)
7. Danish  (857)
8. Dutch  (307)
9. Finnish  (304)
10. Japanese  (285)
11. Swedish  (111)
12. Icelandic  (28)
13. Turkish  (6)
14. Norwegian  (4)
15. Bulgarian  (3)
16. Hebrew  (3)
17. Czech  (1)
18. Portuguese  (1)
19. Romanian  (1)
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Journal Title 

1. Anal. Chem.;  (18)
2. Analytical Chemistry  (21)
3. Journal Of Geophysical Research  (31)
4. Journal Of Nuclear Science And Technology  (20)
5. Nuclear Instruments & Methods  (208)
6. Public Opinion Quarterly  (19)
7. Social Forces  (26)
8. Sol. Energy  (26)
9. Sol. Energy;  (22)
10. Solar Energy  (49)
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